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by doctorhandshake 800 days ago
What you’re talking about is factored in to system design - it’s called the 1% design temperature.

https://www.greenbuildingadvisor.com/article/design-temperat...

As CP says, you design your system for the conditions 99% of the time, because designing for that last 1% leads to a terrible cost benefit calculation. Same reason you don’t daily drive an armored personnel carrier with a 300-gallon gas tank.